" There!" Mars finished writing and threw the scroll at Octavian. "A prophecy. You can add it to your books, engrave it on the floor, whatever."
Octavian read the scroll. "This says, 'Go to Alaska. Find Thanatos and free him. Come back by sundown on June twenty-fourth or die'."
"Yes," Mars said. "Is that not clear?"
"Well, my lord...usually prophecies are unclear. They're wrapped in riddles. They rhyme, and..."
Mars casually popped another grenade off his belt. "Yes?"
"The prophecy is clear!" Octavian announced. "A quest! "

― Rick Riordan , The Son of Neptune (The Heroes of Olympus, #2)